CN100356430C - Liquid crystal driver and its driving method - Google Patents
Liquid crystal driver and its driving method Download PDFInfo
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- CN100356430C CN100356430C CNB031549063A CN03154906A CN100356430C CN 100356430 C CN100356430 C CN 100356430C CN B031549063 A CNB031549063 A CN B031549063A CN 03154906 A CN03154906 A CN 03154906A CN 100356430 C CN100356430 C CN 100356430C
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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- Crystallography & Structural Chemistry (AREA)
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Disclosed is a liquid crystal driving device, which is without a gate PCB, having improved uniformity of screen, and a driving method thereof. The liquid crystal driving device comprises: a sequence recognition means for recognizing sequence of a pertinent gate driver IC by a pulse width of a vertical start signal inputted in synchronization with a vertical synchronous signal, and generating a Carry signal and location data of the pertinent gate driver IC; and a gate-off voltage generation means for receiving a first gate-off voltage and the location data of the pertinent gate driver IC, and outputting a second gate-off voltage which is generated by subtracting a voltage attenuation quantity corresponding to the location data of the gate driver IC from the first gate-off voltage.
Description
Technical field
The present invention relates to LCD drive g device and driving method thereof, in particular for making all mutual display images equably of liquid crystal panel drive the LCD drive g device and the driving method thereof of liquid crystal.
Background technology
Recently, about the technology of liquid crystal indicator (TFR-LCD:Thin Film Transistor Liquid Crystaldisplay) towards guaranteeing that low cost, in light weight, low-power consumption and high reliability direction develop.Thus, develop and produced in batches on the lower basal plate of liquid crystal board to form the glass of the signal wire figure of this drive signal and data-signal (the LineOn Glass that reaches the standard grade is provided to each of a plurality of gate driving IC (Integrated Circuit) that do not have gate pcb (Printed Circuit Board :) and flexible printed circuit (Flexible PrintedCircuit :) and a plurality of source electrode drive IC hereinafter referred to as FPC hereinafter referred to as PCB; Hereinafter referred to as LOG) liquid crystal indicator of type.
Fig. 1 is the figure of the LOG type liquid crystal indicator that does not have grid PCB of expression prior art, as shown in the figure, comprising: liquid crystal board 10 is formed by the liquid crystal combination by upper substrate 10a and lower basal plate 10b; Source PCB 12; A plurality of source electrode drive IC 16 are installed on the TCP (Tape Carrier Package) 14, are electrically connected with a sidepiece and the source PCB 12 of lower basal plate 10b; A plurality of gate driving IC20, a plurality of source electrode drive IC 16 and power supply that the opposite side of the lower basal plate 10b that installs on TCP18 is electrically connected; Signal wire figure 22 along the connecting portion formation of described TCP18 and a plurality of gate driving IC16, is used to provide the control signal of controlling and driving signal and a plurality of gate driving IC20.
Described liquid crystal board 10 constitutes, and comprising: press a plurality of data lines (DL) of column direction arrangement and press a plurality of gate lines (GL) that line direction is arranged; A plurality of thin film transistor (TFT)s (ST) of in the intersection region of a plurality of data lines (DL) and a plurality of gate line (GL), arranging with array way; Liquid crystal capacitor (the C that between a plurality of thin film transistor (TFT)s (ST) and common electrode, forms
LC); Be driving grid, the gate turn-on/pick-off signal that provides by source drive PCB12 is applied to a plurality of gate lines (GL) in turn by signal wire figure 22 again, makes the data-signal that applies by source drive IC14 be applied to a plurality of data lines (DL).Can use COF (Chip on Film) to replace described TCP.
Fig. 2 is the figure of the signal wire figure 22 of detailed presentation graphs 1, and the part identical with Fig. 1 used same reference number.In the drawings, reference number 24 expressions are used for the drive signal of a plurality of gate driving IC20 outputs is sent to a plurality of output channels of liquid crystal board 10 sides.
In the available liquid crystal display device of Gou Chenging, signal wire figure 22 comprises resistance components as previously mentioned, and this resistance components (R1, value R2) is by the metal material that uses, and thickness and width determine.For example, under the situation of amorphous silicon film transistor liquid crystal indicator (a-Si TFT LCD), the resistance value of signal wire figure 22 from several ohm (Ω) to hundreds of ohm (Ω).Particularly, when forming signal wire figure 22 on liquid crystal board 10, it is narrow and small that figure forms the space, so resistance value increases.Therefore, being used for the gate drive signal of the gate turn-on of thin film transistor (TFT) (ST)/end, each this voltage level reduces one by one through a plurality of gate driving IC20, certainly leads to voltage and descends.
Fig. 3 is the oscillogram of gate drive signal of the gate driving IC of expression prior art.In the drawings, illustrate respectively: reference number GD1 is the gate drive signal of the 1st gate driving IC, and reference number GD2 is the gate drive signal of the 2nd gate driving IC, and reference number GD3 is the gate drive signal of the 3rd gate driving IC.
As can be seen from Figure 3, the grid cut-off voltage (V of the 1st gate driving IC
G01) level change with the resistance of signal line graph 22 and the electric current that flows through, and along with before the gate driving IC of terminal and then raise.In more detail, the grid cut-off voltage (V of the 2nd gate driving IC
G02) the gate driving IC of the 1st of level ratio be elevated to high relatively level, the grid cut-off voltage (V of the 3rd gate driving IC
G03) the gate driving IC of the 2nd of level ratio be elevated to high relatively level.
On the other hand, similar to the situation of the signal wire figure 22 that is used to apply described gate drive signal, for applying data-signal to a plurality of data lines (DL), in the signal wire figure (not shown) that forms on the sidepiece of the lower basal plate 10b of liquid crystal board 10, also can produce the delay of data voltage signal owing to the impedance of the impedance of signal wire self and a plurality of data line (DL).
As previously mentioned,, the amplitude of gate drive signal is reduced, because TFT conduction and cut-off family curve produces the poor of data voltage charge volume and leakage rate because the voltage that the signal wire figure produces descends and signal delay.Such present situation along with liquid crystal indicator to high resolving power, the duration of charging that the frame rate increase causes (1 horizontal cycle) reduce large scale development with liquid crystal board, owing to increasing, the length of line becomes more serious, the result is in the picture of reality, produce piece (Block) present situation that the brightness of a plurality of gate driving IC interblocks dissimilates, the problem of the low inferior picture quality of the discrete and response speed of the homogeneity of hypomere, flicker on the picture.
In all sorts of ways for solving such problem, can making.One of them method is to increase the width of signal wire figure 22, by reducing resistance value, the rising of compensation grid cut-off level.But this method is because the restraining factors in the design are difficult to application in practice.Because in liquid crystal indicator, the zone that is used to form the lower basal plate of signal wire figure 22 is restricted, and, the narrower in width of the signal wire figure 22 that in the connecting portion of a plurality of gate driving IC20, forms.
Other method is, increases the size of liquid crystal board, fully guarantees to be used for the zone of the lower basal plate of signal wire figure 22.But this not only is not inconsistent with nearest low cost and light-weighted requirement, and the International standardization problem of product size can occur being difficult to tackle.
Other method is, makes the resistance value of the internal signal line graph that exists in a plurality of gate driving IC20 consistent with the signal wire figure of liquid crystal board, reduces dispersing of picture on the interface between a plurality of gate driving IC20.But this method all must change the design of a plurality of gate driving IC20 each time owing to various variablees such as liquid crystal board size and resolution, has the problem of economic aspect.
Fig. 4 is in the liquid crystal indicator of expression prior art, the data waveform of the pictorial element of different gate lines and the figure of charging curve.Illustrate respectively in the drawings: reference number 1 is the grid voltage waveform that the gate line to epimere applies; The 2nd, the waveform of the data voltage that applies to the gate line of epimere; The 3rd, the pictorial element charging voltage in the gate line of epimere, 1 ' is the grid voltage waveform that the gate line to hypomere applies; 2 ' is the waveform of the data voltage that applies of the gate line to hypomere; 3 ' is the pictorial element charging voltage in the gate line of hypomere.
As shown in Figure 4, reduce Δ V by gate turn-on (on) voltage
GON, the gate turn-on electric current reduces, and reduces Δ V by grid by (off) voltage
Goff, leakage current increases, and charge volume only reduces Δ V
c
Fig. 5 is in the liquid crystal indicator of expression prior art, according to the characteristic figure of the data current of grid voltage.Illustrate respectively in the drawings: the current characteristics zone when reference number a is conducting (on), b is the leak current characteristic zone when ending (off).
Fig. 6 is in the liquid crystal indicator of expression prior art, the figure of the charging voltage of the data of different gate lines.Here X-axis is represented gate line, and Y-axis is represented charging voltage.Illustrate respectively in the drawings: reference number d is the recharge voltage level of wishing, e is actual recharge voltage level, and f is a piece present situation generation area.
As can be seen from Figure 6, the gate line that is driven by a plurality of gate drivers (Driver0, Driver1, Driver2) is because the signal delay of other data line, the decay that produces charging voltage.
Summary of the invention
The 1st purpose of the present invention provides a kind of LCD drive g device, by in the liquid crystal indicator that does not have grid PCB, in the grid cut-off voltage in the input signal line graph, the order of corresponding gate driving IC deducts predetermined voltage attenuation amount, make and improve image evenness by the same grid cut-off voltage of generation in each gate driving IC.
The 2nd purpose of the present invention is for solving described problem, a kind of LCD drive g device and driving method thereof are provided, by in the liquid crystal indicator that does not have grid PCB, the number of corresponding gate driving IC and gate line, the level of data-signal is promoted, the decay of offset data signal level improves image evenness.
Realize the LCD drive g device of the present invention of described the 1st purpose, be a kind of by producing gate turn-on/the end LCD drive g device that drives liquid crystal, it is characterized in that, comprise: the serial number identification component, from with the synchronous pulse width of the vertical commencing signal of input of vertical synchronizing signal, the serial number of identification grid-driving integrated circuit, the position signalling of generation carry signal and described grid-driving integrated circuit; The grid cut-off voltage generation part, import the position data of the 1st grid cut-off voltage and described grid-driving integrated circuit, deduct the voltage attenuation amount of the position data of corresponding described grid-driving integrated circuit from described the 1st grid cut-off voltage, export the 2nd grid cut-off voltage.
Realize the LCD drive g device of the present invention of the described the 1st and the 2nd purpose, comprise: the serial number identification component, from with the synchronous pulse width of the vertical commencing signal of input of vertical synchronizing signal, the serial number of identification grid-driving integrated circuit, the position signalling of generation carry signal and described grid-driving integrated circuit; The grid cut-off voltage generation part, import the position data of the 1st grid cut-off voltage and described grid-driving integrated circuit, deduct the voltage attenuation amount of the position data of corresponding described grid-driving integrated circuit from described the 1st grid cut-off voltage, export the 2nd grid cut-off voltage; Liquid crystal board has a plurality of signal wire figures that are used to apply data-signal; Look-up table is stored a plurality of reference datas corresponding with the number of grid-driving integrated circuit; The reference data generating unit in described a plurality of reference datas, is selected one of them output; Boosting section, by the data of input and the reference data of described selection are added computing, the signal level of the described data of boosting is imported described a plurality of signal wire figure with the data of boosting; Count section to the vertical synchronizing signal counting, produces count value; Control part, control described reference data generating unit, make and calculate multiple parameter values according to the number of grid-driving integrated circuit and gate line, the count value of more described count section and described multiple parameter values of calculating, according to comparative result, with reference to described look-up table, in described a plurality of reference datas, select one of them output.
Description of drawings
Fig. 1 is the liquid crystal indicator that does not have gate pcb of expression prior art.
Fig. 2 is the figure of the signal wire figure of detailed presentation graphs 1.
Fig. 3 is the oscillogram of output waveform of the grid-driving integrated circuit of expression prior art.
Fig. 4 is in the liquid crystal indicator of expression prior art, the data waveform of different gate lines and the figure of charging curve.
Fig. 5 is in the liquid crystal indicator of expression prior art, according to the characteristic figure of the data current of grid voltage.
Fig. 6 is in the liquid crystal indicator of expression prior art, the figure of the charging voltage of the data of different gate lines.
Fig. 7 is the figure of principle of the calculating grid cut-off voltage of explanation one embodiment of the invention.
Fig. 8 is the block scheme of the LCD drive g device of expression one embodiment of the invention.
Fig. 9 is the block scheme of serial number identification signal generating unit of the grid-driving integrated circuit of expression one embodiment of the invention.
Figure 10 is the grid-driving integrated circuit of an embodiment of invention and the connection layout of signal wire figure.
Figure 11 is the oscillogram of carry signal of the grid-driving integrated circuit of an embodiment of expression invention.
Figure 12 is the sequential chart of output signal of the grid-driving integrated circuit of an embodiment of expression invention.
Figure 13 is the block scheme of the LCD drive g device of expression another embodiment of the present invention.
Figure 14 is the figure of the look-up table of expression another embodiment of the present invention.
Figure 15 is the process flow diagram of the LCD drive method of explanation another embodiment of the present invention.
Figure 16 is the data waveform of expression another embodiment of the present invention.
Embodiment
Below preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 7 is the figure of principle of the calculating grid cut-off voltage of explanation one embodiment of the present of invention.Illustrate respectively in the drawings: reference number 40 is signal wire figures, the 42nd, and TCP, the 44th, gate driving IC.At this, can use COF to replace described TCP to use.
As shown in Figure 7, the front end at signal wire figure 40 applies grid cut-off voltage (V
GI), so electric current (I
g) flow into the end side of signal wire figure 40.At this moment, be defined as Rp as the whole resistance with signal wire figure 40, then the voltage of signal wire figure 40 (Vs) is expressed as Ig * Rp.
In one embodiment of the invention, produce same grid cut-off voltage (V among each gate driving IC44 for making
G0), from the grid cut-off voltage (V of input signal line graph 40
GI) in deduct the predetermined voltage attenuation amount of the serial number of corresponding gate driving IC, promptly by voltage (V with signal wire figure 40
s) be multiplied by the voltage attenuation amount that the number of the gate driving IC of corresponding gate driving IC position is tried to achieve.
For example: under the liquid crystal indicator situation of using N gate driving IC, the 1st the grid cut-off voltage (V of gate driving IC from importing
GI) voltage (V of subtraction signal line graph 40
s) and the product of gate driving IC number N, generate grid cut-off voltage (V
G01).
The 2nd the grid cut-off voltage (V of gate driving IC from importing
GI) voltage (V of subtraction signal line graph 40
s) and the product of the number N-1 of gate driving IC, generate grid cut-off voltage (V
G02).
Such process repeats, N the grid cut-off voltage (V of gate driving IC from importing
GI) voltage (V of subtraction signal line graph 40
s) and the product of the number 1 of gate driving IC, generate grid cut-off voltage (V
G0N).
Can be by the formula of the described example of following formula 1 explanation.
[formula 1]
V
G01＝V
GI-(V
s×N)
V
G02＝V
GI-(V
s×N-1)
V
G0N＝V
GI-(V
s×1)
Fig. 8 is the block scheme of the LCD drive g device of expression one embodiment of the present of invention.As shown in the figure, constitute by following parts: serial number identification component 60, from with the synchronous pulse width of the vertical commencing signal (STV) of input of vertical synchronizing signal (CPV), discern the position of this gate driving IC, produce the position data (GLS) of carry signal (Carry) and described gate driving IC; Grid cut-off voltage generation part 80, input grid cut-off voltage (V
GI) and the position data (GLS) of described gate driving IC, from grid cut-off voltage (V
GI) deduct the voltage attenuation amount of the position data (GLS) of corresponding described gate driving IC, export the 2nd grid cut-off voltage (V
G0).
Fig. 9 is the block scheme of serial number identification signal generating unit 60 of the grid-driving integrated circuit of expression one embodiment of the present of invention, constitute by following parts:, produce the m digit counter 60a of the position data of described grid-driving integrated circuit counting with the pulse width of the synchronous described vertical commencing signal of importing of described vertical synchronizing signal; According to the position data (GLS) of described grid-driving integrated circuit value, produce the carry signal generating unit 66b of carry signal (Carry) of the pulse width variation of described vertical commencing signal (STV).
Figure 10 is the grid-driving integrated circuit of an embodiment of invention and the connection layout of signal wire figure.As shown in the figure, (44a 44b) is connected to earth terminal or logic power line to the switch leads that comprises among the gate driving IC44 in signal wire figure 40.
(44a, position 44b) make it be connected easily with earth terminal or logic power line preferably to set described switch leads.
Because the resistance (Rp) of described signal wire figure 40 and grid cut-off current (Ig) can produce difference along with the resolution of liquid crystal indicator, the size of liquid crystal board and the characteristic (material, thickness and width) of signal wire figure etc., so consider and to preestablish several states according to the resistance (Rp) and the grid cut-off current (Ig) of the easy signal wire figure of making 40 of general technology.Therefore, the suitable number of by-pass cock lead-in wire.
For example, (44a is under situation 44b), from switch leads (44a using 2 switch leads, when 44b) combination of Shu Chu signal (SW1, SW2) is logic level 00, corresponding the 1st state, during logic level 01, corresponding the 2nd state, during logic level 10, corresponding the 3rd state, during logic level 11, corresponding the 4th state.The signal of the 1st to the 4th state produces offset according to the resolution of liquid crystal indicator, the size of liquid crystal board and the characteristic (material, thickness and width) of signal wire figure etc., offers grid cut-off voltage generating unit 80.
Figure 11 is the oscillogram of serial number identification signal of the grid-driving integrated circuit of expression one embodiment of the present of invention.As shown in the figure, reference number Carry1 is the carry signal that outputs to the 2nd gate driving IC in the 1st gate driving IC as vertical commencing signal.Reference number Carry2 is the carry signal that outputs to the 3rd gate driving IC in the 2nd gate driving IC as vertical commencing signal.
Below with reference to Figure 11 explanation work of the LCD drive g device of one embodiment of the present of invention of formation as previously mentioned.
At first in serial number identification part 60, m digit counter 60a and vertical synchronizing signal (CPV) are synchronous, the vertical commencing signal (STV) of the 1st gate driving IC of counting input, value according to counting, discern the position of this gate driving IC, produce the m bit position data (GLS) that are associated with the serial number of described gate driving IC.
Next, in serial number identification part 60, the position data (GLS) that carry signal generating unit 60b provides according to m digit counter 60a, process the pulse height of vertical commencing signal (STV), as shown in figure 11, produce carry signal (Carry1) with pulse width wideer than the vertical commencing signal (STV) among the 1st gate driving IC of input.This carry signal (Carry1) is used as the vertical commencing signal of the gate driving IC of next serial number.
Next, grid cut-off voltage generating unit 80 provides position data (GLS) by serial number identification part 60, by signal wire figure 40 input grid cut-off voltage (V
GI).
Next, grid cut-off voltage generating unit 80 is by from grid cut-off voltage (V
GI) deduct the voltage attenuation amount of the position data (GLS) of corresponding described gate driving IC, produce grid cut-off voltage (V
G0), drive liquid crystal.
Action as in the liquid crystal indicator a plurality of gate driving IC that use all being carried out in turn then can produce the grid cut-off voltage (V with same level in each gate driving IC
G0).
On the other hand, in one embodiment of this invention, use is from switch leads (44a, 44b) the 1st to the 4th status signal of the combination of Shu Chu signal (SW1, SW2) is by the grid cut-off voltage (V according to each gate driving IC of compensation such as the resolution of liquid crystal indicator, the size of liquid crystal board and the characteristics (material, thickness and width) of signal wire figure
G0) the change part, make the grid cut-off voltage (V can in each gate driving IC, export same level
G0).
Under the situation of using the 1st to the 4th status signal, the work of grid cut-off voltage generating unit 80 is described, at first, grid cut-off voltage generating unit 80 provides position data (GLS) by serial number identification part 60, by signal wire figure 40 input grid cut-off voltage (V
GI), input is from switch leads (44a, 44b) Shu Chu signal (SW1, SW2).
Next, grid cut-off voltage generating unit 80 is by from grid cut-off voltage (V
GI) deduct the voltage attenuation amount of the position data (GLS) of corresponding described gate driving IC, add the bucking voltage value of corresponding described the 1st to the 4th status signal, produce compensation grid cut-off voltage (V
G0), drive liquid crystal.
As the action in the liquid crystal indicator a plurality of gate driving IC that use all being carried out in turn, by compensate the grid cut-off voltage (V of each gate driving IC according to the resolution of liquid crystal indicator, the size of liquid crystal board and the characteristic (material, thickness and width) of signal wire figure etc.
G0) the change part, make simultaneously in each gate driving IC, to produce grid cut-off voltage (V with same level
G0).
Figure 12 is the sequential chart of output signal of gate driving IC of an embodiment of expression invention.In the drawings, illustrate respectively: STV is vertical commencing signal, and CPV is a vertical synchronizing signal, and LS is a data load signal, and G0 is the output signal of gate driving IC, i.e. the grid pick-off signal.
In the data load signal (LS) of Figure 12, the signal of representing with solid line is existing data load signal, and the signal that is represented by dotted lines is the data load signal of one embodiment of the present of invention.
On the other hand, in the output signal (G0) of the gate driving IC of Figure 12, the signal of representing with solid line is the output signal of existing gate driving IC, and the signal that is represented by dotted lines is the output signal of the gate driving IC of one embodiment of the present of invention.
Gate driving IC imports the vertical commencing signal with fixing pulse width according to one embodiment of present invention, is that the output data of obtaining source drive IC is applied to the adjusting of the time of liquid crystal board according to the serial number of this pulse width of identification.
Therefore, in one embodiment of the invention, adjusting be used for the output data of source drive IC be applied to liquid crystal board load signal (LS) application time and the output signal of described gate driving IC is applied to time of liquid crystal board, as shown in figure 12, the output signal (GDO) that produces data load signal (LS) and gate driving IC only is the delay of stipulated time (T) with respect to existing signal etc.
Figure 13 is the block scheme of the LCD drive g device of expression an alternative embodiment of the invention.As shown in the figure, its component parts is: liquid crystal board 100, look-up table 200, reference data generating unit 300, boosting section 400, count section 500, control part 600.
Look-up table 200 is stored a plurality of reference datas of the number of corresponding gate driving IC.Reference data generating unit 300 can be chosen an output wantonly from a plurality of reference datas.Boosting section 400 input data (InputData) and the reference data of selecting from look-up table 200, by with two data additions, the signal level of the data of boosting (Input Data) makes these boosted data import the 1st signal wire figure (not shown).Count section 500 is counted the rising edge of this vertical synchronizing signal (CPV) or the transition number of negative edge by input vertical synchronizing signal (CPV), generates 2 of count value (CNT) and advances to be worth the counter formation.The described reference data generating unit 300 of control part 600 controls, make and to calculate multiple parameter values (P1～Pn) according to the number (GDN) of the number (GLN) of gate line and gate driving, the count value (CNT) of comparison count section 500 and the multiple parameter values of calculating (P1～Pn), according to comparative result, with reference to look-up table 200, in look-up table 200, in a plurality of reference datas of storage, choose an output wantonly.
According to one embodiment of present invention, (P1～Pn) is set at and the number (GLN) of the gate line different value that has given weighted value of division value (GLN/GDN) divided by the number (GDN) of gate driving for described multiple parameter values.For example, the 1st parameter value (P1) is 1* (GLN/GDN), and the 2nd parameter value (P2) is 2* (GLN/GDN), and the 3rd parameter value (P3) is 3* (GLN/GDN).
Figure 14 is the figure of expression look-up table of the present invention.The number (GDN) of gate drivers is represented on No. 1 hurdle, and No. 2 the reference data (REF) corresponding with the number (GDN) of gate drivers represented on the hurdle.
According to one embodiment of present invention, described reference data (REF) depends on the number (GDN) of grid integrated circuits, the number of gate line, the size of liquid crystal board, parameters such as resolution and frame rate.
Figure 15 is for the process flow diagram of data creating method of the present invention is described.
Below quote the data creating method that Figure 15 illustrates that the present invention is correlated with.
At first in the count section 500, the count value (CNT) of the transition number of the vertical synchronizing signal (CPV) that the generation counting descends or rises (S100).
Then, control part 600 inputs are calculated multiple parameter values (P1～Pn) (S110) by the count value (CNT) of count section 500 countings according to the number of gate driving IC and gate line.At this moment, by giving to calculate multiple parameter values (P1～Pn) divided by the different weighted value of the division value (GLN/GDN) of the number (GDN) of gate driving with the number (GLN) of gate line.
Described the 110th step (S110) afterwards, control part 600 is relatively judged count value (CNT) and the multiple parameter values (size (S120, S130, S140) of each of P1～Pn) in turn.
In described the 120th step (S120), the result of Pan Duaning relatively, when the size of count value (CNT) is bigger than multiple parameter values (P1), carried out for the 130th step (S130), when the size of count value (CNT) was big unlike multiple parameter values (P1), control part 600 control reference data generating units 300 were with reference to look-up table 200, a plurality of reference datas of having deposited in look-up table 200 (among the REF0～REFn-1), are selected the 1st reference data (REF0) output (S150).
In described the 130th step (S130), the result of Pan Duaning relatively, when the size of count value (CNT) is bigger than multiple parameter values (P2), carried out for the 140th step (S140), when the size of count value (CNT) was big unlike multiple parameter values (P2), control part 600 control reference data generating units 300 were with reference to look-up table 200, a plurality of reference datas of having deposited in look-up table 200 (among the REF0～REFn-1), are selected the 2nd reference data (REF0) output (S150).
In described the 140th step (S130), the result of Pan Duaning relatively, when the size of count value (CNT) is bigger than multiple parameter values (P2), carry out next relatively determining step (not shown), when the size of count value (CNT) was big unlike multiple parameter values (P2), control part 600 control reference data generating units 300 were with reference to look-up table 200, a plurality of reference datas of having deposited in look-up table 200 (among the REF0～REFn-1), are selected the 3rd reference data (REF0) output (S150).
Then, addition portion 400, go on foot the reference data addition that (S150) selects the data (Input Data) of input with by the described the 150th, the signal level (S160) of the data of boosting (Input Data) outputs to the 1st signal wire figure (figure does not show) that is installed in the liquid crystal board 100 (S170) with the data after boosting.
Figure 16 is the data waveform of epimere gate line of expression an alternative embodiment of the invention and the data waveform of hypomere gate line.As shown in the figure, reference number Vd represent an alternative embodiment of the invention by the voltage after the additive operation.
As can be seen from Figure 16, in whole grid epimeres and hypomere, pixel electrode is charged to same data voltage level.
The front illustrates and illustrates specific embodiment of the present invention, and the personnel that self-evident the present invention has by the industry carry out the possibility that various deformation is implemented.Bian Xing embodiment should must not regard the structure that comprises in the appended claim scope of the present invention as from technological thought of the present invention and other understanding of prediction generating like this.
As mentioned above, in the grid cut-off voltage of the present invention in the input signal line graph, the order of corresponding gate driving IC deducts predetermined voltage attenuation amount, make the same grid cut-off voltage of generation in each gate driving IC, remove because the brightness of the bulk that the grid cut-off voltage of gate driving IC produces is discrete, obtain uniform image quality.And, because the restriction with the width of signal wire figure reduces to the grid cut-off voltage on the liquid crystal board, during therefore according to resolution and liquid crystal board size formation figure, the range of choice of resistance value enlarges, thus, by increasing the width of different signal wire figure such as ground connection, reach the reduction anti noise.
And, the number of corresponding grid-driving integrated circuit of the present invention and gate line promotes the level of data-signal, when the number of gate drivers increases, by producing the data of higher signal level, the decay of the signal level of offset data, simultaneously, can make voltage charging that whole gate lines of epimere and hypomere are recharged to the voltage level of wishing, prevent the difference of charging voltage and the low problem of grid blockade, homogeneity, flicker and response speed that the duration of charging delay causes, obtain other effect that picture quality improves.
Claims (14)
1, a kind ofly it is characterized in that, comprising by producing gate turn-on/end the LCD drive g device that drives liquid crystal:
The serial number identification component, from the synchronous pulse width of the vertical commencing signal of input of vertical synchronizing signal, the serial number of identification grid-driving integrated circuit produces the position signalling of carry signal and described grid-driving integrated circuit;
The grid cut-off voltage generation part, import the position data of the 1st grid cut-off voltage and described grid-driving integrated circuit, deduct the voltage attenuation amount of the position data of corresponding described grid-driving integrated circuit from described the 1st grid cut-off voltage, export the 2nd grid cut-off voltage.
2, LCD drive g device as claimed in claim 1 is characterized in that:
Described serial number identification component is made of following parts: to counting with the pulse width of the synchronous described vertical commencing signal of importing of described vertical synchronizing signal, produce the m digit counter of the position data of described grid-driving integrated circuit; According to the position data value of described grid-driving integrated circuit, produce the carry signal generating unit of described carry signal of the pulse width variation of described vertical commencing signal.
3, LCD drive g device as claimed in claim 1 is characterized in that:
Described carry signal provides as the vertical commencing signal of the grid-driving integrated circuit of next section.
4, LCD drive g device as claimed in claim 1 is characterized in that:
Described grid cut-off voltage generation part is transfused to more than one status signal at least.
5, LCD drive g device as claimed in claim 4 is characterized in that:
Described at least more than one status signal is by the characteristic decision of the size of resolution, liquid crystal board and signal wire figure.
6, LCD drive g device as claimed in claim 4 is characterized in that:
Described grid cut-off voltage generation part, after deducting the voltage attenuation amount of position data of corresponding described grid-driving integrated circuit from the grid cut-off voltage of input, add corresponding described at least more than one the offset of status signal, produce described the 2nd grid cut-off voltage.
7, a kind of LCD drive g device is characterized in that, comprising:
The serial number identification component, from the synchronous pulse width of the vertical commencing signal of input of vertical synchronizing signal, the serial number of identification grid-driving integrated circuit produces the position signalling of carry signal and described grid-driving integrated circuit;
The grid cut-off voltage generation part, import the position data of the 1st grid cut-off voltage and described grid-driving integrated circuit, deduct the voltage attenuation amount of the position data of corresponding described grid-driving integrated circuit from described grid cut-off voltage, export the 2nd grid cut-off voltage;
Liquid crystal board has a plurality of signal wire figures that are used to apply data-signal;
Look-up table is stored a plurality of reference datas corresponding with the number of grid-driving integrated circuit;
The reference data generating unit in described a plurality of reference datas, is selected one of them output;
Boosting section, by the data of input and the reference data of described selection are added computing, the signal level of the described data of boosting is imported described a plurality of signal wire figure with the data of boosting;
Count section to the vertical synchronizing signal counting, produces count value;
Control part, control described reference data generating unit, make and calculate multiple parameter values according to the number of grid-driving integrated circuit and gate line, the count value of more described count section and described multiple parameter values of calculating, according to comparative result, with reference to described look-up table, in described a plurality of reference datas, select one of them output.
8, LCD drive g device as claimed in claim 7 is characterized in that:
Described serial number identification component comprises: to counting with the pulse width of the synchronous described vertical commencing signal of importing of described vertical synchronizing signal, produce the m digit counter of the position data of described grid-driving integrated circuit; According to the position data value of described grid-driving integrated circuit, produce the carry signal generating unit of described carry signal of the pulse width variation of described vertical commencing signal.
9, LCD drive g device as claimed in claim 7 is characterized in that:
Described carry signal provides as the vertical commencing signal of the grid-driving integrated circuit of next section.
10, LCD drive g device as claimed in claim 7 is characterized in that:
Described grid cut-off voltage generation part is transfused to more than one status signal at least.
11, LCD drive g device as claimed in claim 10 is characterized in that:
Described at least more than one status signal is by the characteristic decision of the size of resolution, liquid crystal board and signal wire figure.
12, LCD drive g device as claimed in claim 10 is characterized in that:
Described grid cut-off voltage generation part, after deducting the voltage attenuation amount of position data of corresponding described grid-driving integrated circuit from the grid cut-off voltage of input, add corresponding described at least more than one the offset of status signal, produce described the 2nd grid cut-off voltage.
13, LCD drive g device as claimed in claim 7 is characterized in that:
Described a plurality of reference data is by size, resolution and the frame rate decision of the number of described grid-driving integrated circuit, the number of gate line, described liquid crystal board.
14, LCD drive g device as claimed in claim 7 is characterized in that:
Described multiple parameter values are set at the value that the number of gate line has been given different weighted values divided by the division value of the number of gate driving.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR18397/03 | 2003-03-25 | ||
| KR1020030018397A KR100687336B1 (en) | 2003-03-25 | 2003-03-25 | Liquid crystal driving device and the driving method thereof |
| KR18397/2003 | 2003-03-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1532795A CN1532795A (en) | 2004-09-29 |
| CN100356430C true CN100356430C (en) | 2007-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031549063A Expired - Lifetime CN100356430C (en) | 2003-03-25 | 2003-08-22 | Liquid crystal driver and its driving method |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US8022915B2 (en) |
| JP (1) | JP4262024B2 (en) |
| KR (1) | KR100687336B1 (en) |
| CN (1) | CN100356430C (en) |
| TW (1) | TWI249722B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100687336B1 (en) * | 2003-03-25 | 2007-02-27 | 비오이 하이디스 테크놀로지 주식회사 | Liquid crystal driving device and the driving method thereof |
| US20070040789A1 (en) * | 2005-08-17 | 2007-02-22 | Samsung Electronics Co., Ltd. | Protection device for gate integrated circuit, gate driver, liquid crystal display including the same and method of protecting a gate IC in a display |
| KR101158899B1 (en) * | 2005-08-22 | 2012-06-25 | 삼성전자주식회사 | Liquid crystal display device, and method for driving thereof |
| EP1884911A1 (en) * | 2006-08-03 | 2008-02-06 | St Microelectronics S.A. | Optimized row cut-off voltage |
| JP5022651B2 (en) * | 2006-08-31 | 2012-09-12 | 株式会社ジャパンディスプレイイースト | Display device |
| KR101298095B1 (en) * | 2006-09-21 | 2013-08-20 | 삼성디스플레이 주식회사 | Sequence controller and and liquid crystal dispaly having the same |
| JP4400605B2 (en) * | 2006-09-25 | 2010-01-20 | カシオ計算機株式会社 | Display driving device and display device |
| US8564252B2 (en) | 2006-11-10 | 2013-10-22 | Cypress Semiconductor Corporation | Boost buffer aid for reference buffer |
| CN101290409B (en) * | 2007-04-17 | 2010-05-19 | 北京京东方光电科技有限公司 | Gate drive circuit and LCD device |
| US8035401B2 (en) * | 2007-04-18 | 2011-10-11 | Cypress Semiconductor Corporation | Self-calibrating driver for charging a capacitive load to a desired voltage |
| JP2009128888A (en) * | 2007-11-28 | 2009-06-11 | Sanyo Electric Co Ltd | Liquid crystal drive circuit |
| TWI424411B (en) * | 2009-12-31 | 2014-01-21 | Au Optronics Corp | Electroluminescence device |
| US8364870B2 (en) | 2010-09-30 | 2013-01-29 | Cypress Semiconductor Corporation | USB port connected to multiple USB compliant devices |
| CN102568406A (en) * | 2010-12-31 | 2012-07-11 | 北京京东方光电科技有限公司 | Grid line driving method and device of liquid crystal display |
| US9667240B2 (en) | 2011-12-02 | 2017-05-30 | Cypress Semiconductor Corporation | Systems and methods for starting up analog circuits |
| JP2015018117A (en) * | 2013-07-11 | 2015-01-29 | 大日本印刷株式会社 | Driving method of reflection type display device |
| KR20150078857A (en) * | 2013-12-31 | 2015-07-08 | 엘지디스플레이 주식회사 | Protecting Curcuit of Memory and LCD having the Same |
| CN105761701B (en) * | 2016-05-20 | 2018-10-30 | 深圳市华星光电技术有限公司 | The circuit of the gate voltage signal provided to liquid crystal display is provided |
| CN106875913A (en) * | 2017-04-21 | 2017-06-20 | 京东方科技集团股份有限公司 | Shift register cell and its driving method, gate driving circuit |
| US10606828B2 (en) * | 2017-10-19 | 2020-03-31 | Jpmorgan Chase Bank, N.A. | Storage correlation engine |
| CN108806634A (en) * | 2018-07-17 | 2018-11-13 | 惠科股份有限公司 | The driving method of shift registor, display panel and shift registor |
| KR20220068709A (en) | 2020-11-19 | 2022-05-26 | 주식회사 엘엑스세미콘 | Data processing device and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US599074A (en) * | 1898-02-15 | Acetylene-gas generator | ||
| US5155477A (en) * | 1988-11-18 | 1992-10-13 | Sony Corporation | Video signal display apparatus with a liquid crystal display unit |
| US20010028337A1 (en) * | 2000-04-06 | 2001-10-11 | Chi Mei Optoelectronics Corp. | Method of reducing flickering and inhomogeneous brightness in LCD |
| US20020149318A1 (en) * | 2001-02-13 | 2002-10-17 | Samsung Electronics Co., Ltd. | Shift register and liquid crystal display using the same |
| JP2002353792A (en) * | 2001-05-24 | 2002-12-06 | Sanyo Electric Co Ltd | Drive circuit and display device |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW270993B (en) * | 1994-02-21 | 1996-02-21 | Hitachi Seisakusyo Kk | Matrix liquid crystal display and driving circuit therefor |
| JP3107980B2 (en) * | 1994-09-29 | 2000-11-13 | シャープ株式会社 | Liquid crystal display |
| JP3037886B2 (en) * | 1995-12-18 | 2000-05-08 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Driving method of liquid crystal display device |
| TW394917B (en) * | 1996-04-05 | 2000-06-21 | Matsushita Electric Ind Co Ltd | Driving method of liquid crystal display unit, driving IC and driving circuit |
| KR100202171B1 (en) * | 1996-09-16 | 1999-06-15 | 구본준 | Driving circuit of liquid crystal panel |
| JP2003015613A (en) * | 2001-06-29 | 2003-01-17 | Internatl Business Mach Corp <Ibm> | LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DRIVER, LCD CONTROLLER, AND DRIVING METHOD IN A PLURALITY OF DRIVER ICs. |
| US7145527B2 (en) * | 2001-06-29 | 2006-12-05 | Lg Electronics Inc. | Field emission display device and driving method thereof |
| KR100874637B1 (en) * | 2001-12-20 | 2008-12-17 | 엘지디스플레이 주식회사 | Line on Glass Liquid Crystal Display |
| JP3895186B2 (en) * | 2002-01-25 | 2007-03-22 | シャープ株式会社 | Display device drive device and display device drive method |
| JP4353676B2 (en) * | 2002-05-24 | 2009-10-28 | 富士通マイクロエレクトロニクス株式会社 | Integrated semiconductor circuit, display device, and signal transmission system |
| TW578122B (en) * | 2002-06-05 | 2004-03-01 | Au Optronics Corp | Driving circuit for thin film transistor liquid crystal display |
| KR100687336B1 (en) * | 2003-03-25 | 2007-02-27 | 비오이 하이디스 테크놀로지 주식회사 | Liquid crystal driving device and the driving method thereof |
-
2003
- 2003-03-25 KR KR1020030018397A patent/KR100687336B1/en active IP Right Grant
- 2003-07-15 TW TW092119205A patent/TWI249722B/en not_active IP Right Cessation
- 2003-07-16 US US10/621,250 patent/US8022915B2/en not_active Expired - Lifetime
- 2003-07-22 JP JP2003277926A patent/JP4262024B2/en not_active Expired - Lifetime
- 2003-08-22 CN CNB031549063A patent/CN100356430C/en not_active Expired - Lifetime
-
2011
- 2011-07-11 US US13/179,680 patent/US8334830B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US599074A (en) * | 1898-02-15 | Acetylene-gas generator | ||
| US5155477A (en) * | 1988-11-18 | 1992-10-13 | Sony Corporation | Video signal display apparatus with a liquid crystal display unit |
| US20010028337A1 (en) * | 2000-04-06 | 2001-10-11 | Chi Mei Optoelectronics Corp. | Method of reducing flickering and inhomogeneous brightness in LCD |
| US20020149318A1 (en) * | 2001-02-13 | 2002-10-17 | Samsung Electronics Co., Ltd. | Shift register and liquid crystal display using the same |
| JP2002353792A (en) * | 2001-05-24 | 2002-12-06 | Sanyo Electric Co Ltd | Drive circuit and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20110267335A1 (en) | 2011-11-03 |
| US20040189573A1 (en) | 2004-09-30 |
| KR100687336B1 (en) | 2007-02-27 |
| US8022915B2 (en) | 2011-09-20 |
| TWI249722B (en) | 2006-02-21 |
| JP4262024B2 (en) | 2009-05-13 |
| US8334830B2 (en) | 2012-12-18 |
| KR20040083771A (en) | 2004-10-06 |
| CN1532795A (en) | 2004-09-29 |
| JP2004295071A (en) | 2004-10-21 |
| TW200419512A (en) | 2004-10-01 |
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